Saved by a Dragon by Lauren Lively

The doorways stand between two worlds – do they hold the keys that will unlock their survival as well as their passion?
Astrid lives a normal, unremarkable life. She owns and operates a bookstore, has a small circle of friends, and avoids social interaction like the plague. She’s alone most of the time, but that’s how she likes it. It’s routine, there are no unexpected surprises – or chances of being hurt.
All of that changes though, when a chance encounter with a mysterious man turns her world upside down. Suddenly, nothing is routine and unexpected surprises are the norm.

Quint is a Dragonborn Warden, a guardian and protector of humanity. He takes his job as a sacred responsibility and is single-minded in his determination to wipe out the evil Shongtal where ever he finds them.
But when he meets Astrid, he begins to change. His priorities begin to change That singlemindedness slowly gives way to something else within him.
Astrid and Quint stir something deep within one another and it’s a primal call that neither can deny – nor do they want to. But will they survive the coming fight to indulge in those primal passions that have set their minds and bodies ablaze?